9x10-7 , -6x10-7 and 8x10-7 are fixed at the corners A,B and C of an equilateral triangle of side 5 cm Find the electric force on the charge at C due to the rest two.(A)2.28593 Nt (B)2.48593 Nt (C)2.68593 Nt (D)2.58593 Nt